userChrome.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");


/* Contextual toolbar buttons, only show on hover, this is what matters, the rest of the file are just style tweaks I like
 */


:root:not([customizing]) #nav-bar toolbarbutton
 {
    margin-left: -28px !important;
    opacity: 0 !important;
    transform: scale(.85, .85) !important;
    pointer-events: none !important;
    transition: all 100ms var(--animation-easing-function) !important;
}

:root:not([customizing]) :hover > #nav-bar toolbarbutton,
:root:not([customizing]) #navigator-toolbox:focus-within #nav-bar toolbarbutton,
:root:not([customizing]) :hover > #titlebar toolbarbutton {
    transform: scale(1, 1) !important;
opacity:1 !important;
margin-left:0 !important;
pointer-events: auto !important;
}


/* auto collapse nav bar height when in stealth mode (not active), kinda jumpy and annoying after a while so let's just comment it for now */

/*
#nav-bar {
	height: 30px !important;
    transition: all 300ms var(--animation-easing-function) !important;
}

:root:not([customizing]) :hover > #nav-bar,
:root:not([customizing]) #navigator-toolbox:focus-within #nav-bar {
height: 35px !important;
}
*/

/* url bar text shrinks when in "stealth mode" */
#nav-bar #urlbar {
font-size: 0.85em !important;
    transition: all 100ms var(--animation-easing-function) !important;
}

:root:not([customizing]) :hover > #nav-bar #urlbar,
:root:not([customizing]) #navigator-toolbox:focus-within #nav-bar #urlbar {
font-size: 1.2em !important;
}


/* some experimentation with expanding tab on hover to see the title better, it's kinda stupid but I was just messing around, could be something useful in the future */
.tabbrowser-tab:not([selected]):hover { 
   min-width: 300px !important;
   transition: min-width 150ms var(--animation-easing-function) 2s !important;
}


/* random style tweaks I like */
/*
Remove borders everywhere, some code copied from edge style for firefox
*/

 :root {
  --tabs-border: transparent !important;
}

.tabbrowser-tab::after, .tabbrowser-tab::before {
   border-left: none !important;
}

#urlbar, .searchbar-textbox {
  border: none !important;
  box-shadow: none !important;
}

#nav-bar {
	margin-top: 0px !important;
	border-top: 0px !important;
	box-shadow: none !important;
}

/* nav bar is semi opaque when unhovered */
#nav-bar > * {
opacity:0.5;
transition: opacity 0.3s;
}

#nav-bar:hover > * {
opacity:1 !important;
}

#urlbar {
opacity:1 !important;
}

#urlbar .urlbar-input-box {
opacity:1 !important;
}


#urlbar, .searchbar-textbox {
	border: 0px !important;
	height: 20px !important;
}

#urlbar {
	margin-left: 1px !important;
	margin-right: 1px !important;
}

.tab-background {
	border-top: none !important;
}

.tabs-newtab-button, #new-tab-button, #alltabs-button {
	color: rgba(240, 240, 240, 1);
	border-top: 0px !important;
	margin-bottom: 0px !important;
}


window:not([chromehidden~="toolbar"]) #urlbar-container > .toolbarbutton-1:-moz-any([disabled], :not([open]):not([disabled]):not(:active)) > .toolbarbutton-icon[class], #main-window:not([customizing]) #back-button[disabled] > .toolbarbutton-icon[class] {

	box-shadow: none !important;
	border: 0px !important;
}

/* bookmarks toolbar edge style */

toolbarbutton.bookmark-item {
	border: 1px rgba(0, 0, 0, 0) solid !important;
}

toolbarbutton.bookmark-item:hover {
	background-color: rgba(75, 75, 75, 1);
	border: 1px rgba(75, 75, 75, 1) solid !important;
}

.titlebar-placeholder[type="post-tabs"] {
	width: 50px !important;
}

#TabsToolbar {
	margin-bottom: 0px !important;
}
#navigator-toolbox::after {
	border-bottom: 0px !important;
}


#TabsToolbar .tab-background {
	border-right: 0px !important;
	border-left: 0px !important;
}
.scrollbutton-up, .scrollbutton-down {
	margin-bottom: 0px !important;
}
.scrollbutton-up:hover, .scrollbutton-down:hover {
	background: rgba(42, 42, 42, 1) ;
}
.scrollbutton-up:hover:active, .scrollbutton-down:hover:active {
	background: #444;
}
.tabs-newtab-button .toolbarbutton-icon {
	background: transparent ;
}
#urlbar, .searchbar-textbox {
	box-shadow: none !important;
}
.close-icon > .toolbarbutton-icon {
	border-radius: 0px !important;
}
#TabsToolbar[movingtab] {
	padding-bottom: 0px !important;
}
#TabsToolbar[movingtab] > .tabbrowser-tabs {
	padding-bottom: 0px !important;
	margin-bottom: 0px !important;
}
#new-tab-button > .toolbarbutton-icon, #alltabs-button > .toolbarbutton-icon {
	background-color: transparent;
}
:root {
	--toolbarbutton-border-radius: 0px !important;
}



#context-back > .menu-iconic-left, #context-forward > .menu-iconic-left, #context-reload > .menu-iconic-left, #context-stop > .menu-iconic-left, #context-bookmarkpage > .menu-iconic-left {
	padding: 0px !important;
}

#tabbrowser-tabs {
	--tab-line-color: -moz-win-accentcolor !important;
	--tab-loading-fill: -moz-win-accentcolor !important;
box-shadow: none !important;
}
#tabbrowser-tabs:-moz-window-inactive {
	--tab-line-color: rgb(128, 128, 128) !important;
}

.webextension-browser-action {
filter: saturate(0%);
}


:root[lwtheme-image]:-moz-lwtheme-brighttext {
    text-shadow: none !important;
}


/*
 * Only show close buttons on background tabs when hovering with the mouse
 *
 * Contributor(s): Timvde
 */

.tabbrowser-tab:not([selected]):not([pinned]) .tab-close-button {
  display: none !important;
}

.tabbrowser-tab:not([selected]):not([pinned]):hover .tab-close-button {
  display: -moz-box !important;
}

/*
 * Underlines and dims unloaded tabs
 *
 * Contributor(s): josemam
 */

.tabbrowser-tab[pending] {
 font-style: italic;
}


toolbarspring {
    min-width: 8px;
    max-width: 8px;
}

/* Change tab max width */
.tabbrowser-tab[fadein]:not([pinned]) {
    max-width: 300px !important;
}